android 创建、删除 文件和文件夹 测试

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        File sdCard = Environment.getExternalStorageDirectory();    //取得sdCard 的目录
        
        try {
            //测试创建文件和文件夹
            boolean CreateFileResult = createFile(sdCard.getAbsolutePath(),"sdCreateFile.sq",false); //创建文件
            boolean CreateDirResult = createFile(sdCard.getAbsolutePath(),"sdCreateDir.dir",true);    //创建文件夹
            
        } catch (IOException e) {e.printStackTrace();}
        //测试删除文件和文件夹
        boolean deleteFileResult = deleteFile(sdCard.getAbsolutePath(), "sdCreateFile.sq");
        boolean deleteDirResult  = deleteFile(sdCard.getAbsolutePath(), "sdCreateDir.dir");
        
    }
    
    //创建文件夹或目录
    boolean createFile(String path,String fileName,boolean isDir) throws IOException
    {
        File dir = new File(path);
        if(dir.exists()!=true) return false;        //path no exists
        File newFile = new File(path+"/"+fileName);
        return isDir==true? newFile.mkdir():newFile.createNewFile();
    }
    
    //删除文件夹或目录
    boolean deleteFile(String path,String fileName)
    {
        File dir = new File(path);
        if(dir.exists()!=true)return false;        //path no exists
        return new File(path+"/"+fileName).delete();
    }